The shadows on Eevee are clippy?
Try 'high bit depth' and / or 'soft shadows' in the render panel 'shadows' bit, or maybe the 'method' or 'cube size' / 'cascade size' (hover over tool-tip says what type of light they are for).

There's also the 'softness', 'bias', 'exponent' etc. settings in the light properties tab (when you've the light selected obviously), and more 'cascade shadow map' settings - if it's a 'sun' type light.